中国卡林型金矿的分布规律及找矿前景

我国卡林型金矿床主要分布于扬子陆块西南缘的板内古生代-中生代沉降带和西北缘古生代-中生代造山带。具有分布局限、成矿集中的特点。金矿床往往形成成矿带,单个金矿床的规模大小不一,矿化受构造、围岩和深部流体控制。金矿床成矿域发育一套大面积分布的巨厚的古-中生代造山带建造,成矿期的岩浆活动和构造活动强烈。基于我国卡林型金矿的分布规律,找矿应优先考虑的有力部位有:1)地块边缘裂陷槽拉张与挤压交替的环境中沉积建造和不同性质大地构造接合部位或构造过渡带;2)在背斜构造倾伏端、背斜轴转折端、背斜翼部以及不同方向、不同序次的断裂破碎带交叉与复合部位;3)在富粘土质、粉砂质和有机质中发育的交叉断裂和可微渗透的纹层状细粒钙质和白云质粉砂岩,局部为较粗粒砂岩和透镜状砾状钙质生物碎屑岩夹层接触部位;4)在燕山期岩浆活动以及热点活动地区发育的古生界和中生界地层。

Carlin-type Told Deposits Distribution and Prospecting in China

The Carlin-type gold deposits are mostly found in Paleozoic-Mesozoic intra-block depressed zone at the southwestern margin of the Yangtze Block and miogeosyncline northwest of the Yangtze Block with the characters of local and massive distribution.Tthe gold deposits often occur in minerogenetic zones with different scales.The mineralization is controlled by structures,strata and deep fluids.In the minerogenetic regions of this type of gold deposits,very thickly and widely distributed Paleozoic-Mesozoic miogeosyncline sediments,and tectonic and magmatic activities developed extensively at that time.Base on the distribution regularities of Carlin-type gold deposits,Carlin-type gold deposits searching in China should give priority to the locations as follows: 1) Between the pullapart and extrusion alternative environment of plot edge cracks which have miogeosyncline deposition characteristic and different nature tectonic units's interface or tectonic zone;2) In plunging anticline structure,anticline axis turning,anticline wings,the crossover and composite parts of fracture zones which have different directions and different sequence;3) In the cross fracture and differentiable infiltration of laminated fine-grained calcareous and dolomitic siltstones which rich in clayey,silty and organic matter,more coarse-grained sandstone and lenticular brecciform calcareous rocks sandwich contact site in Local;4) In the Paleozoic and Mesozoic stratigraphic region which development Yanshanian magmatic and hot activities.